Fig. 9.

Performance of the SoftKiller on jet shapes, compared to area–median subtraction and the recently proposed Constituent Subtractor method [11]. All results are shown for dijet events with a 500 GeV $p_t$ cut on anti-$k_t$, $R=0.4$ jets. For comparison of the subtraction performance we also quote, for each observable $X$, ${\mathit{\sigma }}_{X,\mathrm{hard}}$, the dispersion of the distribution of the observable in the hard event. For ${\mathit{\tau }}_{21}$ there is the additional requirement (in the hard event) that the jet mass is above 30 GeV and for ${\mathit{\tau }}_{32}$ we further impose ${\mathit{\tau }}_{21}\ge 0.1$ (again in the hard event), so as to ensure infrared safety